Atmospheric-Pressure Low-Temperature Plasma for Low-Energy Adhesive Bonding
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Solution Overview
Problem
Existing methods for bonding substrates with adhesives, particularly on low-energy surfaces like PE, PP, or EPDM, face challenges in achieving satisfactory adhesion, and physical pretreatments like corona or plasma can be non-universal and damaging, leading to reduced adhesive strength in humid and warm conditions.
Innovation Solution
Using a low-temperature plasma treatment at atmospheric pressure, generated by a piezoelectric effect, to activate both the substrate and adhesive surfaces before bonding, ensuring minimal thermal damage and enhancing adhesive strength and moisture-heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If physical pretreatment (corona, plasma, flame) is applied to activate low-energy substrate surfaces, then adhesion of adhesive is improved, but thermal damage and unwanted byproducts occur leading to reduced adhesive strength in humid and warm conditions
Solution Approach 1:
The patent applies low-temperature plasma treatment instead of conventional high-temperature plasma or corona treatment. By changing the temperature parameter from high to low, the method activates the substrate surface for improved adhesion while avoiding thermal damage and formation of unwanted byproducts that would reduce adhesive strength under humid and warm conditions.
Solution Approach 2:
The patent uses atmospheric pressure plasma which does not require vacuum systems, making the process simpler and more suitable for continuous production. The plasma treatment is applied locally at the bonding interface rather than treating entire surfaces, reducing energy consumption and avoiding widespread thermal damage.
2Strength
If conventional plasma treatment is used to activate surfaces, then adhesion is improved, but the process requires vacuum cycles reducing productivity
Solution Approach 1:
The patent changes the pressure parameter from vacuum to atmospheric pressure for plasma generation. This allows the plasma treatment to be performed in open air without requiring vacuum chambers or vacuum cycles, enabling continuous treatment of substrates in production lines and significantly improving productivity.
Solution Approach 2:
The atmospheric pressure plasma system enables continuous treatment of substrates as they move through the processing line, eliminating the intermittent operation required by vacuum-based systems. The plasma can be generated continuously at atmospheric pressure, maintaining constant activation of surfaces for bonding.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method significantly improves adhesive strength and resistance to humid and warm conditions by creating reactive centers at the interface, reducing unwanted byproducts, and allowing continuous treatment without vacuum cycles.
Implementation Method 1
low-temperature plasma treatment at atmospheric pressure, generated by a piezoelectric effect
Implementation Method 2
low-temperature plasma treatment at atmospheric pressure, generated by a piezoelectric effect, to activate both the substrate and adhesive surfaces
Implementation Method 3
activate both the substrate and adhesive surfaces before bonding, ensuring minimal thermal damage and enhancing adhesive strength
Data Source
Figure 1a~2
Figure 3~4
Figure 5a~6
AI summary
The invention relates to a method for bonding a substrate surface (2) of a substrate to an adhesive substance surface (4) of an adhesive substance (3), by generating a low-temperature plasma in a low-temperature plasma generator, activating the substrate surface and/or the adhesive substance surface (4) by means of the low temperature plasma, and then layering said substrate surface (2) and adhesive substance surface (4) one onto the other in order to form a bonded composite.